EVENT 201 Girls Open 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 1 | Brook MCGREGOR | 12 | Thanet Swim | 6:32.50 |
| 4 | 3 | Evelyn FORNASIER | 12 | Sevenoaks | 6:26.90 |
| 5 | 2 | Verity NICHOLAS | 12 | Dover Life | 6:26.90 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 5 | Sum Yau TSE | 12 | Tonbridge | 6:22.00 |
| 1 | 7 | Isabelle MAY | 12 | Maidstone SC | 6:18.75 |
| 2 | 9 | Isabelle SAVAGE | 12 | Maidstone SC | 6:16.50 |
| 3 | 11 | Lola BOWRA | 13 | Black Lion | 6:06.70 |
| 4 | 14 | Emily PIETERSMA | 13 | Bexley | 6:00.50 |
| 5 | 12 | Olivia COOLEY | 13 | Maidstone SC | 6:04.90 |
| 6 | 10 | Amelia ASHTON | 13 | Sevenoaks | 6:07.70 |
| 7 | 8 | Nel DZIKI | 12 | RTW Monson | 6:17.20 |
| 8 | 6 | Lola BOURNER | 12 | Black Lion | 6:19.90 |
| 9 | 4 | Rosie HOLLANDS | 12 | Dover Life | 6:22.50 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 16 | Calyssa BRADSHAW | 14 | Black Lion | 5:52.00 |
| 1 | 18 | Tilly POLLARD | 14 | Ashford Sch | 5:51.20 |
| 2 | 20 | Martha WARNER | 14 | Bromley | 5:49.10 |
| 3 | 22 | Maisie DENNEY | 18 | Erith & Dist | 5:48.60 |
| 4 | 24 | Natasha GREER | 16 | Gwich Royals | 5:47.80 |
| 5 | 23 | Abigail FOSH | 14 | Bexley | 5:48.50 |
| 6 | 21 | Cora TARLING | 16 | Gwich Royals | 5:48.80 |
| 7 | 19 | Daisy SMITH | 14 | Bexley | 5:50.50 |
| 8 | 17 | Lowri WILLIAMS | 13 | RTW Monson | 5:51.30 |
| 9 | 15 | Emily STONE | 13 | Sevenoaks | 5:56.00 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 26 | Josephine LAWN | 13 | Bromley | 5:47.40 |
| 1 | 28 | Amelia JAMES | 15 | Maidstone SC | 5:45.70 |
| 2 | 30 | Ruby WALLER | 15 | Sevenoaks | 5:42.40 |
| 3 | 32 | Jessica LONG | 12 | Bromley | 5:37.20 |
| 4 | 34 | Lilly DELLER | 14 | Dartford | 5:36.70 |
| 5 | 33 | Emilia NARKEVIC | 13 | Maidstone SC | 5:37.10 |
| 6 | 31 | Ruby HALL | 13 | White Oak | 5:38.20 |
| 7 | 29 | Jessica PERKINS | 14 | Faversham | 5:43.90 |
| 8 | 27 | Olivia QUILLER | 12 | Maidstone SC | 5:46.80 |
| 9 | 25 | Esmee STANLEY | 17 | Dartford | 5:47.70 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 36 | Hannah STROVER | 18 | Orpington OJ | 5:35.50 |
| 1 | 38 | Kayla MOERMAN | 17 | Black Lion | 5:34.30 |
| 2 | 40 | Mia HUGHES | 14 | Bromley | 5:27.10 |
| 3 | 42 | Abbie OUTRAM | 17 | Maidstone SC | 5:18.38 |
| 4 | 45 | Amalie SMITH | 14 | Tonbridge | 5:13.67 |
| 5 | 44 | Scarlett DAVIE | 15 | White Oak | 5:17.10 |
| 6 | 41 | Cara NEAL | 14 | Sevenoaks | 5:20.90 |
| 7 | 39 | Molly LOWN | 18 | Dover Life | 5:32.70 |
| 8 | 37 | Ella-Louise DOYLE | 17 | Gwich Royals | 5:34.90 |
| 9 | 35 | Erin O'HARA | 17 | Saxon Crown | 5:35.50 |